This paper reports on the effect of molybdenum disilicide (MoSi₂) addition on the densification and mechanical properties of boron carbide (B₄C). Molybdenum disilicide powder (10 and 30 wt%) was added to boron carbide powder and consolidated by hot pressing at various temperatures (1700–1900 °C) and pressures (30–50 MPa) in 0.001 Pa vacuum. MoSi₂ was found to react with B₄C and form reaction products SiC, MoB₂ and Mo₂B₅. Slight improvement in density was observed with respect to MoSi₂ addition. High density compact has been obtained with 30 wt% MoSi₂ at 1900 °C under a pressure of 50 MPa. The hardness, elastic modulus and fracture toughness of high dense B₄C+30 wt% MoSi₂ compact was found to be 35.1 GPa, 555 GPa and 4.8 MPa m^1/2 respectively.